fix(ingest): keep TypeScript ADK's Gemini thinking whole - #1173

🟢 Confidence 4/5 · likely safe to merge
The rule rests on call_llm being the TS ADK model call and never Python ADK's; one synthetic prod span and the captures back that, not more.
_{quality 100/100 · no findings · tests covered · risk medium}

Adds an output_excludes_reasoning rule so TypeScript ADK's Gemini call_llm keeps its thoughts out of the visible output instead of being clamped away, while every other emitter keeps the clamp. Contained to the ingest usage stamping, with tests on both sides.

• output_excludes_reasoning is true only for vendor google_adk on span call_llm
• Usage::read takes the flag and skips the reasoning clamp for that emitter
• New tests cover the exclusive TS ADK call and three inclusive Gemini emitters

_{db32f23 · Updated on every push. Reply "won't fix" to dismiss a finding, or mention @maple-review-bot to ask about one.}